A particular CE amplifier circuit needs to be designed using the form shown The

Question

A particular CE amplifier circuit needs to be designed using the form shown The circuit must meet certain small signal performance specifications. Assume no channel modulation in the MOSFETs and no Early effect in the BJT. Assume (knw/L)1=(knrw/L)2 You will need to specify: Specification Design the circuit to make the current through RD to be 1mA. The small-small gain v0/vsig = 33.3v/v The output resistance of the small-signal circuit circuit is R0 = 1k ohm Givens

Explanation / Answer

in the small signal model the emitter resistance gets shorted. Hence the output resistance would be Ro= Rc||ro||RL where ro is the output resistance of the BJT=Io/VA where VA is the early voltage and I0 is the dc collector current in the BJT Since given no early effect ro can be excluded RL is the load resistance which is given and requirement is Ro=1Kohms Hence Rc can be found using the gain of CE amplifier (exact and not simplified) we can thus find gm=> we can find r pi,BJT internal resistance and the dc collector current and thus everything follows NOTE:The MOSFET configuration is a current mirror

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